CVE-2019-16254 Other in n/a

What is CVE-2019-16254?

CVE-2019-16254 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.

Weakness: CWE-74

Which versions are affected by CVE-2019-16254?

It affects 2 products.

Products include Debian Debian Linux, Ruby-Lang Ruby.

How do I fix CVE-2019-16254?

Upgrade to a fixed version.

Is CVE-2019-16254 being exploited?

There is no known exploitation of CVE-2019-16254 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2019-16254, CLEANSTART-2026-DS16175, DEBIAN-CVE-2019-16254, GHSA-w9fp-2996-hhwx, UBUNTU-CVE-2019-16254.